50 NL AK pre against aggressive stealer 5 bet shove?

[starkwired]

Poker Stars - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $50.25
Hero (BB): $62.90
UTG: $66.65
MP: $17.65
CO: $50.90
BTN: $68.65

Preflop: Hero is dealt A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, <font color="red">CO raises to $2.00</font>, 2 folds, <font color="red">Hero raises to $6.00</font>, <font color="red">CO raises to $15.00</font>, Hero ?

Lot of metagame stuff going on here (to me at least). Villain is an aggressive TAG (17/14/3, 300 hands) reg. He'd been stealing from the cutoff almost every orbit and I started reraising him liberally (probably every third steal or so). I finally pick up a legit hand to reraise with, and he three bets me. If villain is a thinking player, he might put me on a steal and make the play with a small PP or whatever, which I would rather just fold at this point, so I'm thinking shove. Do you guys fold here, or even just call? Maybe I'm giving the villain too much credit for thinking about what I'm stealing him with. Obviously the hand plays differently if I'm not OOP/the one facing a 4 bet. Does his bet size matter? Thanks for the opinions.